Generic Trigger SM 50ccm, Owner'S Manual

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Troubleshooting
Difficult to start or unable to start
Troubleshooting Tune-up inspection Failure cause
Enough oil to
carburator
No gasoline
to
carburator
Loosen the oil drain
bolt of carburator to
check whether there
is oil within the
carburator
Spark plug
has flashover
Weak spark or no
spark of spark
plug
Dismantle the spark
plug and put it into
spark plug cover to
connect engine and
check whether the
spark plug has
flashover
Compression
pressure
measurement
Compression
pressure too low,
no compression
pressure
Normal compression
pressure
No ignition
burst
phenomenon of
engine
With burst
phenomenon but
the engine failed
to start
Spark plug is
damp Spark plug is
dry
Dismantle the spark plug
again to re-inspect
No gasoline in gasoline tank
Oil tube clog of gasoline tank carburator
Oil tube clog of float chamber
Conduit clog of evaporation control system of fuel tank
Gasoline filter clog
Auto oil ring is broken
Spark plug is broken
Spark plug is polluted
CDI group is broken
Trigger is broken
The lead of sparking coil is open circuit or short circuit
Sparking coil is open circuit or short circuit
Main switch is broken
Charge coil is broken
Start clutch is broken
Air cylinder piston and piston ring are
broken
Cylinder head leaks
Auto choke actuation is bad
Intaken air in intake manifold
Incorrect ignition time
Bad adjustment of adjustable bolt of
carburetor
Overhigh oil level of carburetor
Auto choke actuation is bad
Too big throttle opening